I want to start by saying I had a delightful meeting about two or three weeks ago—maybe it was a month now—with Darren Hughes in my office. We meant to meet for half an hour and stayed for two hours. It was really informative. So, Darren, don't take this the wrong way if I address all my questions to Professor Becker instead.
Professor, I want to ask you a series of questions.
For one thing, you run a number of models, and I want to explore a bit of them. I want to start by dealing with something you raised in your written submission to this committee but which you did not raise in your presentation this evening, and that is the metric that you used to judge whether or not a system is proportional, the Gallagher index.
Could you chat with us a bit about the Gallagher index and how you apply it to your models?